CN102031775A

CN102031775A - Construction technology of drilled pile in hard oblique rocks by medium hole blasting

Info

Publication number: CN102031775A
Application number: CN2010101990941A
Authority: CN
Inventors: 江拔其; 胡伟; 郑先奇; 徐华轩
Original assignee: China Railway 16th Bureau Group Co Ltd
Current assignee: China Railway 16th Bureau Group Co Ltd
Priority date: 2010-06-12
Filing date: 2010-06-12
Publication date: 2011-04-27
Anticipated expiration: 2030-06-12
Also published as: CN102031775B

Abstract

The invention relates to a construction technology of a drilled pile in hard oblique rocks by medium hole blasting. In the construction technology, the technologies of drilling a hole, charging, injecting water, backfilling and constructing the drilled pile are utilized, and the invention is characterized in that the construction technology of the drilled pile in the hard oblique rocks by medium hole blasting is as follows: using a geological drill to drill a blast hole at the center of the pile; charging explosive in the blast hole; injecting water, backfilling, and blasting; and constructing the drilled pile. The construction technology can be used in the construction of the drilled pile in the hard oblique rocks, the construction speed is fast, the operation is simple, and the cost is low.

Description

Hard tiltedly rock mesopore blasting boreholes pile construction technology

Technical field

The invention belongs to field of civil engineering, particularly relate to a kind of novel hard tiltedly rock mesopore blasting boreholes pile construction technology, adopt the center of geological prospecting rig in stake, boring (Ф=110mm) as the big gun hole, put into the blasting charge and carry out explosion, country rock around the broken big gun hole is easy to drilled pile construction.

Background technology

Karst is to be subjected to the chemical corrosion of water for a long time and to be formed by solubility rocks such as limestone.Karst strata exists solution cavity, lapies, fluid bowl, especially solution cavity top (end) plate interlocking, and height differs greatly.Limestone is subjected to the chemolysis of water for a long time, and the rock stratum exists uneven or half rock, half native, half rock, the half molten and slope rock of soft or hard.It is the difficult point technology of karst pile foundation boring that karst is grown the rock drilled pile inclined hole correction of slope, stratum by force.And the conventional job practices of the drilled pile of in the past taking, the not only time-consuming material that takes, and also construction speed is very slow, and the hard tiltedly rock mesopore blasting boreholes pile construction technology of invention facts have proved that this invention speed of application is fast, and expense is low, easy operating.

Summary of the invention

Adopt the geological prospecting rig in the center of stake, Ф=110mm is as the big gun hole in boring, and blast hole depth lacks 50～80cm than the design hole depth, is not subjected to the destruction of explosion and influences bearing capacity of pile tip to guarantee stake end rock stratum.Because grow the bad ground area by force at karst and carry out drilling construction, solution cavity causes being difficult to pore-forming often.The geological prospecting rig can be taked corresponding technical measures according to non-filler and solution cavity filler situation are arranged in the solution cavity when boring runs into solution cavity: during non-filler, can adopt steel sleeve follow-up guard aperture drilling and forming hole in running into solution cavity; When in running into solution cavity, filler being arranged, can utilize geological prospecting rig pressure injection cement paste according to solution cavity filler situation, at the fixed solution cavity filler of certain limit drilling and forming hole.After boring reaches the requirement hole depth, residue and the interior silt particle of mud in the cleaning hole, utilize rig to carry out hole clearly, silt boring up to prevent that silt particle from refluxing.

Drilled pile deep hole hydraulic pressure demolition, its cartridge bag belongs to the internal action cartridge bag.What design principles of control cartridge bag amount is that its cartridge bag amount causes the crack of big gun hole rock crusher or generation to be controlled in a stake footpath scope and gets final product with interior.At present, the computational methods that the author takes promptly need broken volume to multiply by the total charge that the unit administration amount is exactly the big gun hole as the deep hole hydraulic pressure demolition.For example 333# pier 1# stake, stake footpath 1m, the dark 17m in rock stratum (the dark 34m of stake), then fragmentation volume V=(1/2) ²π * 17=13.35m ², unit with π dose q through trying the quick-fried 1.6kg/m3 that is defined as at last, big gun hole total charge Q=q * V=21.36kg, reality has been adorned 21.6kg.

The present invention compares with open-air deep hole hydraulic pressure demolition, open-air conventional deep hole blasting, chamber blasting and Tunnel Blasting has following advantage: simple to operate, each root has the stake of rock stratum only to design a big gun hole, stake with the big gun hole do not have and get in touch, detonate separately, the design in each big gun hole does not involve parameters such as borehole spacing, array pitch, bench height.

Description of drawings

Fig. 1 electric initiating charge constitution schematic diagram;

Fig. 2 fuse arming test experiment initiation charge constitution schematic diagram.

The specific embodiment

Drilled pile deep hole hydraulic pressure demolition is divided into processes such as boring, powder charge water filling, backfill obstruction and percussive drilling by the construction succession.

1, adopt geology to be drilled in pile center's axial location by big gun hole of stake deep drilling.In boring procedure, owing to soil layer is arranged, may also have solution cavity,, must outside the geology drill bit, put into steel sleeve for preventing to promote the geology drill bit hole of outside the big gun hole, collapsing.Occur the hole of collapsing outside the big gun hole again for preventing that steel sleeve from extracting, must in steel sleeve, reinstall plastic bushing.After treating that plastic bushing is inserted in, just can extract steel sleeve outside the big gun hole, and plastic bushing is still motionless in situ.

2, a reinforcing bar that is tied with a plurality of cartridge bags is put into the big gun hole along plastic bushing, water filling in the plastic bushing then treats that water rises to when the 3m left and right sides, big gun aperture, stops up with the stemming backfill.For preventing that stemming from sneaking in the water, between water and the stemming spacer is arranged, it is just passable as spacer in fact to twist into group with grass.

3, after the explosion, can hole with Churn drill immediately.

Claims

1. hard tiltedly rock mesopore blasting boreholes pile construction technology comprises boring, powder charge water filling, backfill obstruction and percussive drilling, uses the boring of geological prospecting rig, carries out the deep hole hydraulic pressure demolition, and reduction boring rock stratum hardness is accelerated boring drilling depth, correction correction inclined hole.

Described bore process adopts:

Geology is drilled in pile center's axial location by big gun hole of stake deep drilling, and the geology drill bit is put into steel sleeve outward, the plastic bushing of in steel sleeve, packing into, treat that plastic bushing is inserted in after, just can extract steel sleeve outside the big gun hole, and plastic bushing is still motionless in situ.

Process using is stopped up in described powder charge water filling and backfill:

A reinforcing bar that is tied with a plurality of cartridge bags is put into the big gun hole along plastic bushing, and water filling in the plastic bushing then treats that water rises to when the 3m left and right sides, big gun aperture, stops up with the stemming backfill, between water and the stemming spacer is arranged, and available grass twists into group as spacer.